generic locks#3
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Durable record of an op's L2 chunk lock scope. Consumers set this when acquiring a per-chunk indefinite lock so that if the worker dies mid-write, the operator recovery path can locate the partial-write region without a bigtable-wide lock-row scan. Stored as a numpy uint64 array in the op-log row's family 0.
Chunk-scoped row-key counterparts to the existing root indefinite-lock API. Survives worker crash; subsequent temporal acquires on the same row refuse until explicit release. - lock_by_row_key_with_indefinite — temporal acquire rejects if the indefinite column is set - lock_by_row_key_indefinitely — acquire IndefiniteLock - unlock_indefinitely_locked_by_row_key — value-matched release Both bigtable and hbase.
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